Shure SM137-LC Condenser Instrument Microphone for High SPLs

 

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Dale #:SHUR-SM137LC

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  • The Shure SM137 Cardioid Condenser Microphone is a cost-effective small-diaphragm microphone that is well suited for instrument and vocal capturing in project recording and sound reinforcement situations.

    The SM137 features an ultra-thin diaphragm that yields a smooth high-end frequency response with a tight, controlled low-end. A -15dB Pad switch minimizes distortion caused by transient (peaking) audio signals. The microphone's cardioid polar pattern effectively eliminates noise and feedback at the off-axis sections of the capsule.

    Whether miking amplifier cabinets, drums, percussion or vocals, the SM137 is sure to be a modestly priced solution for the studio or the road.

    Features:
    Tight high-end and controlled low frequency response
    Cardioid polar pattern minimizes noise and feedback
    -15dB Pad switch maximizes headroom and reduces distortion
    Ultra-thin, 2.5 μm 24 karat gold-layered, low mass Mylar diaphragm for superior transient respons
    Class A, discrete, transformerless preamplifier for transparency, extremely fast transient response, no crossover distortion, and minimal harmonic and intermodulation distortion
    Premium electronic components, including gold-plated internal and external connectors
    -15dB Pad switch maximizes headroom and reduces distortion

    PERFORMANCE CHARACTERISTICS

    Extended frequency response

    Low self-noise

    Exceptional low-frequency reproduction

    Can withstand high sound pressure levels (SPLs)

    High output level

    No crossover distortion

    Uniform polar response

    Superior common mode rejection and suppression of radio frequency interference (RFI)

    APPLICATIONS

    Electric guitar amplifiers

    Brass and woodwind instruments

    Orchestras, choirs, and wind ensembles

    Overhead miking of drums and percussion instruments

    Close-miking of acoustic instruments such as piano, guitar, violins, drums, and percussion

    Low-frequency instruments such as double bass and kick drum

    Room ambience pick-up (guitar amplifier or drums)

    Note:

    Sound quality is strongly affected by microphone location and room acoustics.

    To achieve the best overall sound for a particular application, it may be necessary to experiment with microphone placement and room treatments.

    Mounting the Microphone

    Thread the supplied stand adapter onto a floor or boom stand and insert the microphone.

    NOTE:

    Since this microphone reproduces ultra-low frequencies, use an isolating shock mount (available at www.shure.com) to reduce low-frequency mechanical vibrations transmitted through the stand.

    Setting Attenuation

    The attenuation switch lets you reduce the signal level without altering the frequency response. This can prevent extremely loud sounds from overloading the microphone.

    0 dB

    For "quiet" to "normal" sound levels.

    -15 dB

    For use with extremely loud sound sources such as drums, horns, or loud guitar cabinets.

    Integral Pop Filter

    The microphone grille consists of 3 separate mesh layers that act as an integral pop filter. This helps reduce wind and breath noise. Depending on the performer, an external pop-protection screen or windscreen may be necessary when closemiking vocalists.

    Load Impedance

    Maximum SPL capability, output clipping level, and dynamic range varies with input load impedance of the preamplifier to which you connect the microphone. Shure recommends a minimum input load impedance of 1000 Ω, and most modern microphone preamplifiers meet this requirement. Higher impedance results in better performance for these specifications.

    Power Requirements

    This microphone requires phantom power and performs best with a 48 Vdc supply (IEC-268-15/DIN 45 596). However, it will operate with slightly decreased headroom and sensitivity with supplies as low as 11 Vdc. Most modern mixers provide phantom power. Phantom power can only be transmitted through a cable terminated with XLR connectors at each end.

  • Type Electret Condenser
    Frequency Response20 to 20,000 Hz
    Polar PatternCardioid
    Output Impedance150 ohms actual
    Sensitivity (at 1 kHz, open circuit voltage)

    -41 dBV/Pa (1 Pascal=94 dB SPL)

    Maximum SPL (1 kHz at 1% THD)

    1000 ohms load: 139 dB (154 dB, Pad on) / 2500 ohms load: 144 dB (159 dB, Pad on)

    Signal-to-Noise Ratio (referenced at 94 dB SPL at 1 kHz)75 dB (S/N ratio is difference between 94 dB SPL and equivalent SPL of self noise, A-weighted)
    Dynamic Range (at 1 kHz)

    1000 ohms load: 122 dB / 2500 ohms load: 128 dB

    Common Mode Rejection (20 Hz to 20 kHz)

    > 50 dB
    Clipping Level (20Hz-20 kHz at 1%THD)

    1000 ohms load: 3 dBV / 2500 ohms load: 9 dBV (THD of microphone preamplifier when applied input signal is equivalent to cartridge output at specified SPL)

    Self Noise (typical, equivalent SPL, A-weighted)19 dB
    Polarity

    Positive pressure on diaphragm produces positive voltage on pin 2 with respect to pin 3

    WeightNet: 195 g (6.9 oz.)
    SwitchAttenuator: -15 dB
    Connector Three-pin professional audio (XLR), male
    Power Requirements48 Vdc phantom, 5.2 mA
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